Question

I am trying to figure out why this code doesn’t fire the radio button change event.

here’s the ASP page code for 2 radio buttons

  <asp:RadioButton ID="rdoButton1" GroupName="Group1" Text="Yes" Value="Yes"  runat="server" OnCheckedChanged="Group1_CheckedChanged" />
  <asp:RadioButton ID="rdoButton2" GroupName="Group1" Text="No" Value="No" runat="server" OnCheckedChanged="Group1_CheckedChanged" />

And here’s the code behind:

protected void Group1_CheckedChanged(Object sender, EventArgs e)
{
    if (rdoButton1.Checked) {
        panel1.Visible = true;
    }

    if (rdoButton2.Checked) {
        panel1.Visible = false;
    }
}

Answer 1

You’ll need to specify the attribute and value AutoPostBack="true" in order to tell ASP.NET that changing of that element should trigger a postback. It should be applied to each individual RadioButton which you wish to cause a postback.